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Single pass honing vs Multipass honing of valve bodies
1. Single pass Honing Vs Multi-pass Honing of valve bodies
Sl
No
Single pass Honing
Multi-pass Honing
1
Honing allowance is shared by 3 to 5
tools. Each tool removes about 5 to 8
microns while the tool pierces through,
causing burr on the edge of grooves in
the bore!
Each micron is removed by about 5 to 10
passes. Hence, material is gradually
removed and there is no burr formation.
When tool completes about 1000 jobs,
the diamond grit flattens out and it starts
plouging the material, creating a fine
burr.
2
Honed surface glazes after a few
thousand cycles, due to worn out
abrasive tool surface.
Additional brushing dislodges even the
micro burrs that may formed.
Honed surface finish is consistent till the
life of abrasive tool. After about 10,000
jobs, the honing ledge is replaced and
abrasive surface becomes brand new.
Self-sharpening effect of the abrasives,
results in free cutting during the tool's
entire operating life.
1
2. Single pass Honing Vs Multi-pass Honing of valve bodies
Sl
No
Single pass -honing
Multi-pass honing
3
The honed surface has helical groove
pattern , less suitable for oil retention.
The honed surface with cross hatch
pattern provides pockets for oil
retention.
4
Less suitable for longer bores(L/D>3);
unless there are grooves, chips do not
get flushed easily.
Same honing accuracy can be achieved
for a range of
L/D=1 to 10
5
Honing accuracy fully depends of
accuracy of bore dia before honing.
Camber error(banana shape) can not be
corrected.
Honing accuracy depends partly on
bore accuracy before honing.
But correction to camber error and
taper is possible.
6
Blind honing is not possible
Blind honing is possible
7
Auto-gauging is generally not used as inprocess correction is not possible.
Air electronic multi-point in-process
gauging automatically leads to
correction of bore size
2